Page 12 of 396

LOCATION OF THE WARNING AND
SPECIFICATION LABELS .......................1-1
SAFETY INFORMATION .........................2-1
DESCRIPTION AND MACHINE
IDENTIFICATION.....................................3-1
Identification number records ...............3-3
Key identification number .....................3-5
Vehicle identification number ...............3-7
Model label ...........................................3-9
CONTROL FUNCTIONS .........................4-1
Main switch ...........................................4-1
Handlebar switches ..............................4-3
Throttle lever ........................................4-5
Throttle OverRide System ....................4-7
Speed limiter ........................................4-9
Clutch lever ........................................4-11
4
3
2
1Front brake lever ................................4-11
Brake pedal ........................................4-13
Parking brake .....................................4-13
Shift pedal ..........................................4-17
Kick starter .........................................4-17
Fuel tank cap ......................................4-19
Fuel cock ............................................4-19
Starter (choke) ....................................4-21
Seat ....................................................4-23
Front shock absorber adjustment .......4-25
Rear shock absorber adjustment .......4-29
PRE-OPERATION CHECKS ...................5-1
Front and rear brakes ...........................5-5
Fuel ....................................................5-11
Engine mixing oil ................................5-15
Transmission oil .................................5-17
Chain ..................................................5-21
Throttle lever ......................................5-21
5
EBU00015
CONTENTS
Page 44 of 396
2-15
8Never modify an ATV through improper instal-
lation or use of accessories.
8Never exceed the stated load capacity for an
ATV. Cargo should be properly distributed and
securely attached. Reduce speed and follow
instructions in this manual for carrying cargo
or pulling a trailer. Allow greater distance for
braking.
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8Always turn off the engine when refueling.
8Do not refuel right after the engine has
been running and is still very hot.
8Do not spill gasoline on the engine or
exhaust pipe/muffler when refueling. Never
refuel while smoking, or while in the vicini-
ty of sparks, open flames, or other sources
of ignition such as the pilot lights of water
heaters and clothes dryers. Gasoline can
catch fire. You could be burned.
Page 48 of 396
3-1
EBU00032
DESCRIPTION AND MACHINE
IDENTIFICATION
1. Tail/brake light 13. Rear wheel
2. Seat 14. Starter (choke)
3. Kick starter 15. Shift pedal
4. Fuel tank cap 16. Clutch lever
5. Headlight 17. Parking brake
6. Brake pedal 18. Main switch
7. Rear brake light switch 19. Front brake lever
8. Front wheel 20. Throttle lever
9. Front shock absorber 21. Handlebar switch
10. Radiator
11. Fuel cock
12. Rear shock absorber
NOTE:
The machine you have purchased may differ
slightly from those shown in the figures of this
manual.
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Page 76 of 396
4-19
EBU00092
Fuel tank cap
Remove the fuel tank cap by turning it counter-
clockwise.
EBU00093
Fuel cock
The fuel cock supplies fuel from the fuel tank to
the carburetor.
The fuel cock has three positions.
OFF: With the lever in this position fuel will not
flow. Always turn the lever to this position
when the engine is not running.
ON: With the lever in this position, fuel flows to
the carburetor. Normal riding is done with
the lever in this position.
RES: This indicates reserve. If you run out of
fuel while riding, turn the lever to this posi-
tion. THEN FILL THE FUEL TANK AT
THE FIRST OPPORTUNITY. After refu-
elling, return the fuel cock lever to the
“ON” position.
q
RES
ON
OFF
1. Fuel tank cap
1. Bouchon de réservoir de carburant
1. Tapón del depósito de combustible
Page 106 of 396
5-11
EBU00131
Fuel
Make sure there is sufficient gasoline in the tank.
NOTE:
1. If knocking or pinging occurs, use a differ-
ent brand of gasoline or higher octane
grade.
2. If unleaded gasoline is not available, then
leaded gasoline can be used.
1. Filler tube 2. Fuel level
1. Tube de remplissage 2. Niveau de carburant
1. Tubo de llenado 2. Nivel de combustible
Recommended fuel:
Regular gasoline
Premium unleaded gasoline with a
research octane number of 95 or
higher.
Fuel tank capacity:
Total: 12 L
Reserve: 2.5 L
Page 108 of 396
5-13
w
8Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is over-
filled, fuel could spill out due to heat from
the engine or the sun.
8Be careful not to spill fuel, especially on
the engine or exhaust pipe which can
cause a fire and severe injury. Wipe up any
spilled fuel immediately.
8Do not refuel right after the engine has
been running and is still very hot.
8Be sure the fuel tank cap is closed secure-
ly.
Page 362 of 396
8-117
EBU00440
Troubleshooting chart
Starting problems or poor engine performance
Check fuel flow
1. Fuel
Check if there is
fuel in the fuel
tank
2. Compression
Kick the kick starter
to see if there is
compression
3. Ignition
Remove plugs and
check electrodes
WetWipe clean with
dry cloth
DryAttach plug cap and
ground to chassisKick the kick
starter stronglySpark weak
Spark goodIgnition system normal
No spark
Ask a Yamaha dealer to inspect
Adjust plug gap or
replace plug(s)
There is compressonCompression normal
Ask a Yamaha dealer to inspectNo compression
There is fuelTurn the fuel
cock to “OFF”
Remove the
fuel pipeNo fuelFuel cock clogged
Some fuelTurn the fuel
cock to “RES”Restart engine
No fuelSupply fuel
Clean fuel cock
Page 380 of 396
10-3
Model YFZ350
Fuel:
Type Premium unleaded gasoline, Premix
Tank capacity 12.0 L
Reserve amount 2.5 L
Carburetor:
Type/quantity VM26SS/2
Manufacturer MIKUNI
Spark plug:
Type/Manufacturer BR8ES/NGK
Spark plug gap 0.7–0.8 mm
Clutch type: Wet, multiple-disc
Transmission:
Primary reduction system Helical gear
Primary reduction ratio 66/23 (2.869)
Secondary reduction system Chain drive
Secondary reduction ratio 41/14 (2.929)
Transmission type Constant mesh 6-speed
Operation Left foot operation